- if ( multi_pass_clouds && draw_clouds ) {
- glClearStencil( 0 );
- clear_mask |= GL_STENCIL_BUFFER_BIT;
- }
- glClear( clear_mask );
-
- // set the opengl state to known default values
- default_state->force();
-
- // update fog params if visibility has changed
- double visibility_meters = fgGetDouble("/environment/visibility-m");
- thesky->set_visibility(visibility_meters);
-
- thesky->modify_vis( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER,
- ( global_multi_loop * fgGetInt("/sim/speed-up") )
- / (double)fgGetInt("/sim/model-hz") );
-
- // Set correct opengl fog density
- glFogf (GL_FOG_DENSITY, fog_exp2_density);
-
- // update the sky dome
- if ( skyblend ) {
- /*
- SG_LOG( SG_GENERAL, SG_BULK, "thesky->repaint() sky_color = "
- << l->sky_color()[0] << " "
- << l->sky_color()[1] << " "
- << l->sky_color()[2] << " "
- << l->sky_color()[3] );
- SG_LOG( SG_GENERAL, SG_BULK, " fog = "
- << l->fog_color()[0] << " "
- << l->fog_color()[1] << " "
- << l->fog_color()[2] << " "
- << l->fog_color()[3] );
- SG_LOG( SG_GENERAL, SG_BULK,
- " sun_angle = " << l->sun_angle
- << " moon_angle = " << l->moon_angle );
- */
-
- static SGSkyColor scolor;
- FGLight *l = (FGLight *)(globals->get_subsystem("lighting"));
-
- scolor.sky_color = l->sky_color();
- scolor.fog_color = l->adj_fog_color();
- scolor.cloud_color = l->cloud_color();
- scolor.sun_angle = l->get_sun_angle();
- scolor.moon_angle = l->get_moon_angle();
- scolor.nplanets = globals->get_ephem()->getNumPlanets();
- scolor.nstars = globals->get_ephem()->getNumStars();
- scolor.planet_data = globals->get_ephem()->getPlanets();
- scolor.star_data = globals->get_ephem()->getStars();
-
- thesky->repaint( scolor );
-
- /*
- SG_LOG( SG_GENERAL, SG_BULK,
- "thesky->reposition( view_pos = " << view_pos[0] << " "
- << view_pos[1] << " " << view_pos[2] );
- SG_LOG( SG_GENERAL, SG_BULK,
- " zero_elev = " << zero_elev[0] << " "
- << zero_elev[1] << " " << zero_elev[2]
- << " lon = " << cur_fdm_state->get_Longitude()
- << " lat = " << cur_fdm_state->get_Latitude() );
- SG_LOG( SG_GENERAL, SG_BULK,
- " sun_rot = " << l->get_sun_rotation
- << " gst = " << SGTime::cur_time_params->getGst() );
- SG_LOG( SG_GENERAL, SG_BULK,
- " sun ra = " << globals->get_ephem()->getSunRightAscension()
- << " sun dec = " << globals->get_ephem()->getSunDeclination()
- << " moon ra = " << globals->get_ephem()->getMoonRightAscension()
- << " moon dec = " << globals->get_ephem()->getMoonDeclination() );
- */
-
- // The sun and moon distances are scaled down versions
- // of the actual distance to get both the moon and the sun
- // within the range of the far clip plane.
- // Moon distance: 384,467 kilometers
- // Sun distance: 150,000,000 kilometers
- double sun_horiz_eff, moon_horiz_eff;
- if (fgGetBool("/sim/rendering/horizon-effect")) {
- sun_horiz_eff = 0.67+pow(0.5+cos(l->get_sun_angle())*2/2, 0.33)/3;
- moon_horiz_eff = 0.67+pow(0.5+cos(l->get_moon_angle())*2/2, 0.33)/3;
- } else {
- sun_horiz_eff = moon_horiz_eff = 1.0;
- }